courier interview

package.json

{
  "name": "vanilla-typescript",
  "version": "1.0.0",
  "description": "JavaScript and TypeScript example starter project",
  "main": "index.html",
  "scripts": {
    "start": "parcel index.html --open",
    "build": "parcel build index.html"
  },
  "dependencies": {
    "jest": "26.3.0"
  },
  "devDependencies": {
    "parcel-bundler": "^1.6.1"
  },
  "keywords": [
    "typescript",
    "javascript"
  ]
}

send.spec.ts

import { send } from "./send";

it("should send message", async () => {
  const payload = {
    body: {
      event: 'NEW_SIGNUP',
      recipient: '8ec8c99a-c5f7-455b-9f60-8222b8a27056',
      brand: 'W50NC77P524K14M5300PGPEK4JMJ',
      data: '{"name": "Jane Doe","age": 27}',
      profile: '{"phone_number": "2025550125","email": "hello@example.com"}'
    },
    json: true
  }
  const result = await send(payload);
  expect(result).toHaveProperty("statusCode", 204);
});

send.ts

import { get as getProfile } from "./services/profile";
import { Json } from "./types";

interface IRequest {
  headers?: {
    [key: string]: string;
  };
  body?: Json & {
    profile: string
  };
}

interface IResponse {
  body?: Json;
  statusCode?: number;
}

type SendFn = (request: IRequest) => Promise<IResponse>;

export const send: SendFn = async (request) => {
  const profile = await getProfile(request?.body?.profile);
  console.log(profile);

  // TODO: more stuff

  return {
    statusCode: 204
  };
};

services-profile.ts

export const get = async (id: string) => {
  return {
    id
  };
};

types.ts

export type Json = JsonMap | JsonArray | string | number | boolean | null;

export interface JsonMap {
  [member: string]: string | number | boolean | null | JsonArray | JsonMap;
}

export interface JsonArray
  extends Array<string | number | boolean | null | JsonArray | JsonMap> {}